SSC JE 2023-Fluid Mechanics: Buoyancy and Flotation-Expected Questions

How much do you know about Fluid Mechanics? And, what do you know about Flotation? Fluid mechanics studies how fluids (liquids, gases, and plasmas) move and the forces on them. Buoyancy is the upward force on an object in a fluid, equal to the weight of the fluid it pushes out. Floatation is when an object floats or stays balanced in a fluid, because its weight and buoyant force are equal.

In this article, we’ll share 5 expected questions packed with Mock Tests (1 Free) that will help you successfully face the questions on Buoyancy and Flotation in the actual SSC JE 2023 exam.

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Fluid Mechanics-Expected Questions

Buoyancy and Floation

1.       The metacentric height of sailing ships is

          (a)   0.45 m to 1.25 m

          (b)   1.5 m to 3.5 m

          (c)   0.25 m to 0.35 m

          (d)   5 m to 7.5 m

Ans. (a) * For sailing ship, GM = 0.45 to 1.25 m

* For merchant ship, GM = 0.3 m to 1m

* For Battle ship, GM = 1 to 1.5 m

* For Passenger ship, GM = 0.3 to 1.5

* For River craft, GM = up to 3.6 m

  2.  “A body, immersed partly or wholly in a fluid at rest, appears to lose a part of its weight, the apparent loss being equal to the weight of the fluid displace” is

          (a)    Archimede’s Principle

          (b)    Pascal’s Law

           (c)    Newton’s Law of Motion

          (d)    None of these

    Ans. (a) : Archimede’s Principle states that ” A body, immersed partly or wholly in a fluid at rest, appears to lose a part of its weight, the apparent loss being equal to the weight of the fluid displace

3.       When a body floating in a liquid is given a small angular displacement, it starts oscillating about a point known as:

          (a)    Centre of pressure

          (b)    Centre of gravity

           (c)    Centre of buoyancy

          (d)    Metacentre

Ans. (d) : When a body floating in a liquid is given a small angular displacement, it starts oscillating about a point known as metacentre.

4.       The upward force on a body immersed in water, because of the fluid surrounding it, is known as _______.

          (a)  Gravitation force (b) Force of viscosity

           (c)  Buoyancy force  (d)  Archimedes force

Ans. (c) : The upward force on a body immersed in water due to surrounding water is known as buoyancy force.

* Archimedes Principal of Buoyancy–When a body fully or partially immersed in liquid then an upward force act on the body due to liquid, that force is called buoyant force or Buoyancy.

· The magnitude of this force is equal to weight of the liquid displaced by body & acts on the centroid of displaced liquid

5.       The stability of a floating body depends upon

          (a)   its volume

          (b)   its weight

          (c)   its metacentric height

          (d)   the specific weight of fluid

Ans. (c) The height between metacenter & center of gravity is called metacentric height.

For stable equilibrium of floating bodies metacentre (M) has to be above the centre of gravity (G).

where,

k_g = Radius of gyration

GM Þ metracentric height

GM ­ Þ T¯

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